The Packing Nut, cataloged under National Stock Number 4730-01-476-4166, is classified within Federal Supply Class 4730 (Hose, Pipe, Tube, Lubrication, and Railing Fittings) of the Pipe, Tubing, Hose, and Fittings group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 12 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-476-4166 |
| Primary Part Number | 845-7286651 ITEM 15 |
| Item Name | Packing Nut |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Hole or Slot Quantity | 1 |
| Thread Length | 2.875 INCHES NOMINAL IN |
| Style Designator | ROUND SLOTTED, EXTERNAL THREAD, BOSS |
| Thread Direction | RIGHT-HAND |
| Thread Size | 2.875-16 |
| Screw Thread Series Designator | UN |
| Thread Class | 3A A |
| Major Unthreaded Outside Diameter | 2.612 INCHES MINIMUM AND 2.615 INCHES MAXIMUM IN |
| Screw Thread Location | EXTERNAL |
| Material | COPPER ALLOY |
| Slot Width | 0.260 INCHES NOMINAL IN |
| Smallest Inside Diameter | 2.250 INCHES MINIMUM AND 2.252 INCHES MAXIMUM IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 845-7286651 ITEM 15 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 2643-825-91 ITEM 15 | 5/9 Secondary reference U.S. Government activity |
| 264382591A-015 | 5/2 Secondary reference U.S. Government activity |
| 2643-825-91 | D/9 Drawing number reference only U.S. Government activity |
| 845-7286651 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 4730-01-476-4166 is a Packing Nut, manufactured by Naval Sea Systems Command, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-476-4166 has 1 manufacturer part number on file: 845-7286651 ITEM 15 (Naval Sea Systems Command).
5 possible matches (shared part number, not a government interchangeability claim): 5305-01-723-7342, 5315-01-727-3568, 5315-01-727-3585. Verify interchangeability with system specifications before substitution.
Key specifications for 845-7286651 ITEM 15: Hole or Slot Quantity: 1; Thread Length: 2.875 INCHES NOMINAL IN; Style Designator: ROUND SLOTTED, EXTERNAL THREAD, BOSS; Overall Length: 0.656 INCHES NOMINAL IN. 12 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.